Synchronism-indicator.



- Patented Oct. 28,1902. J. F. BEGOLE. SYNCHRONISM INDICATOR.

(Appl 15 fil dJ 9 1902) (No Model.)

. gvwavl toz Joshua; F. Begole as, m a I -UNITED STATES JOSHUA F. BEGOLE, OF ST. LOUIS, MISSOURI, ASSIGNOR TO WAGNER ELEC- TRIO MANUFACTURING COMPANY, OF ST. LOUIS, MISSGURI, A CORPORA- TION OF MISSOURI.

SYNCHRONlSiVl-iNDlCATOR.

SPECIFICATION forming part of Letters Patent No. 712,174, dated October as, 1902.

Application filed June 9, 1902 Serial No. 110,773. (No model.)

To all whom it may concern:

Be it known that I, J osnun F. Bnoonn, a citizen of the United States, residing at the city of St. Louis, in the State of Missouri, have invented a certain new and useful Synchronism-Indicator, of which the following is such afull, clear, and exact description as will (anable any one skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings,

forming part of 'this specification.

My invention relates more particularly to new and useful apparatus for ascertaining the moment at which two or more sources of alternating current are acting in synchronism, and has for its object to provide, by means of a new combination of well-known instruments, a synchronism-indicator suitable for central-station usewhich will be simzo ple in construction and in its connections and which will readily indicate to the switch board attendant the proper time at which to throw additional units into connection with the system without disturbing the normal Working conditions of the line.

Intho drawings forming part of this specification and which show embodiments of my invention, Figure 1 shows in diagram inyin- 'vention in connection with a three-phase system; and Fig. 2 shows modifications of my invention applied to a two-phase system.

Like marks of reference refer to similar parts in the difierent views.

Referring iirst to Fig. 1, 1i) and ii. indicate dynamo-electric machines generating threephase alternating current.

d2, 13, and 14 of the generator 10 are con-' nected through switches 15 to the bus-bars .10. The three phases 17, 18, and. 19 of the 0 generatorii may also be connected by means 'of switches 20 with thebus-bars 16. 21 indicates the movable coil, and 22 the stationaryfield-coilspf a ph also-indicator of any suitable and usual construction. --.A pointer 23 ,45 serves to indicate the movementef the movable coil 21. The field-coils 22 of the phaseindicator are connected in series by means of a \circuit 24 across the phase 13 let of the genorator 10, and an ohmic resistance 25 is included in the circuit 24: in series with the coils 22 to protect the instrument. 27 represents the coil of a voltmeter the movable iron arthe generator 11..

The three phases coil 27 in series with said phases 13 1d and 18 19 of the generators 10 and 11. This series connection may be traced from the phase 18. through the wire 30 and one side of the circuit 24 to the phase-terminal 14, thence-through the winding of the generator 10-to the phaseterminal 1S,thence through the remainingside of the circuit 24 through the wire 31 and ohmic resistance 82 to one end of the field-coil 27, whence the'circuit leads by means of the wire 33 back to the generator 11 at the terminal 19. The movable coil 21 of the phase-indicater is connected across the phase 18 1950f The phase l8 l9 corresponds in position to the phase 18 1a of the generator 10, across which the field-coil of the phaseimlicator is connected as above. This connection of the movable coil 21 across the phase 18 19 is made by means of the wires 34- and 35, connected at one end to the wires 30 and and at the other end to the pivots upon which the said movable coil 21 is adapted to rotate. In the wire 3 L is connected an impedancc in the form of a condenser 36 for the purpose of displacing the phase of the current in the movable coil 21, as hereinafter described.

Fig. 2 shows my synohronisin-in.dicating mechanism connected for use in a two-phase altcrnating-currentsystem. Thephasesdil, i2 i3, and 50 51, 53 of the generators 10' and ll may be connected through switches 15 and. 20 with the bus-bars 16, as before described in connection with Fig. 1. In Fig. 2 also, in Fig. 1, 21 represents the movable coil, the field-coils, and 23 the indicating- The fieldcoils 22 of the phase-indicator are connected needle, of the phaseindicator.

cnit'oiha resistance 57 being connectedinseries in the circuit 58 to protect the movable coil. A. voltage indicating mechanism is supplied by a number of incandescent lamps 58, connected in series across the corresponding phases 42 13, 52 53 of the two generators 10 and 11. This series connection is so made that the voltages of the two generatorslO and 11 instead of working together, as is the case when the voltage-indicator isconnected with the generators as shown in Fig. 1, will be opposed to each other, or, in other words, will assume the condition commonly known as bucking. This series connection may be traced from the terminal 40 through one side of the circuit 54 to the wire 60,,theuce through the lamps 5S and wire 61 to the ter minal 50, thence throughthe winding of the generator 11 to the terminal 51,thence through the wire 62 back to the remaining side of the circuit 5-1, through which it passes to the terminal 41, and thence through the winding of the generator 10 back to the terminal 40.

In the operation of my invention, and re fer-ring first to Fig. 1, let it be supposed that the generator 10 is connected with the busbars 16 and engaged in supplying current thereto and that it is desired to cut in the generator 11 when said generator 11 is in synchronism with the generator 10. The fieldcoils 22 and the movable coil 21 of the phaseindicator being connected across corresponding phases of the two generators 10 and 11 and the impedance 36 being made of a value sufficient to place the current flowing through the coil 21 in quadrature with the current flowing in the field-coils 22, it will be observed that as the generator 11 approaches synchronism with the generator 10 the pointer of the phase-indicator will begin to oscillate rapidly back and forth. The oscillationof this pointer 23 will gradually becomeless rapid,and finally the pointer will come to rest when the two generators are either one hundred and eighty degrees apart or in exact synchronism with each other. The voltmeter connected in series across the twb machines will indicate which of these two positions the generatorsoccupy with respect to each other-that is, whether or .not they are in exact synchronism, or one hundred and eighty degrees apart. The voltmeter being connected across the two generators in such a way that the electrometive forces of the generators operate in conjunction with each other, the two machines will be in exact synchronism when the pointer of the volt'meteris in its position of maximum displacement, and the voltmeter-pointer will stand at zero when the machines are one hundred and eighty dcgrccs apart. The proper time, therefore, to cut in the generator 11 will be indicated by the fact that the pointer 23 after slowly oscillating has come. to rest and the pointer 20 of tho voltmeter occupies its position of maximum displacement. When the pointers are in this position, the generator 11 is connected, by means of the switches 20, with the bus-bars l6.

Referring now to .Fig. 2, the operation of my invention is substantially the same as that described in connection with Fig. 1. In the apparatus shown in Fig. 2 quadrature be tween the currents energizing the field-coils and the movable coil of the phase-indicator is obtained by connecting the movable coil 21 of the phase-indicator across that phase of the generator 11 which differs by ninety degrees from that phase of the generator 10 across which the field-coils 22 of the phaseindicatorareconnected. Thisdoesawaywith the necessity of employing an impedance, as indicated at 36 in Fig. 1. In Fig. 2 means for determining whether the two generators are in exact synchronism, or one hundred and eighty degrees apart, is furnished by the incandescent lamps 58 instead of an ordinary voltmeter, as described in connection with Fig. 1. These lamps are so connected across corresponding phases of the generators 10 and 11 that the electromotive forces of the generators will act in opposition to one another. In other words, the lamps are connected for synchronizing dark. The proper time, therefore, for throwing the generator 11 into connection with the bus-bars 16 is when the pointer 23 of the phaseindicator after slowly oscillating has come to rest and the lamps 58 have ceased to burn.

1 am aware that a considerable number of changes may be made in the specific embodiments of my invention herein shown and described, and this is particularly true of the arrangement of the circuits whereby the voltage-indicator and phase-indicator are energized from the generators or other sources of alternating current. Such changes are within the contemplation of my invention and are intended to be covered by the following claims.

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent of the United States, is-- 1. In a synchronism-indicator, two sources of alternating current, a voltage-indicator energized from said sources, and a phase-indicator comprising two coils one of which is movable relative to the other, one of said coils-being supplied with current from one of said sources and the other of said coils being supplied with current from the other of said sources.

2. In a synchronism-indicator, two sources of alternating current, a voltage-indicator in series relation with said sources, and a phaseindicaior comprising two coils one of which is movable relative to the other, one of said coils being supplied with current from one of said sources, and the other of said coils be: ing supplied with current from the other of said sources.

8. In a synchronism-indicator, two sources of alternating current, a voltage-indicator energized from said sources, a phase-indicator comprising two coils one of which is movable relative to the other, one of said coils being supplied with current from one of said sources and the other of said coils being supphed with current from the corresponding phase of the other of said sources, and means for displacing the phase of the currentin one of said coils.

4. In a synehronis1n-indicator, two sources of alternating current, a voltage-indicator in series relation with said sources, a phase-indicator comprising two coils one of which is movable relative to the other, one of said coils being supplied with current from one of said sources and the other of said coils being supplied with current from the corresponding phase of the other of said sources, and means for. displacing the phase of the current in one of said coils.

5. In a synchronisrn-indicatcr, two sources of polyphase alternating current, a voltageindicatcr in series relation with corresponding phases of said sources, a phase-indicator comprising two coils one of which isv movable relative to the other, one of said coils being supplied with currentfrom one of said phases in series relation with said voltage-indicator and the other of said coils being supplied with current from the other of said phases in series relation with said-voltage-indicator, and means for displacing the phase of the current in one of said coils.

s In testimony whereof I have hereunto set my hand and affixed my seal in presence of the two subscribing witnesses.

JOSHUA F. BEGOLE. [L. 8.] 

